Brendan Doyle NASSCo Lateral Committee Chairperson Introduction Why Laterals Should be Rehabilitated How to Evaluate Laterals for Rehab Lateral CCTV Inspection Lateral cleaning Different Lateral Rehab Methods ID: 935116
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Slide1
Overview of Lateral and Main/Lateral Connection Lining and Sealing Technologies
Brendan DoyleNASSCo Lateral Committee Chairperson
Slide2Introduction
Why Laterals Should be Rehabilitated
How to Evaluate Laterals for Rehab
Lateral CCTV Inspection
Lateral cleaning
Different Lateral Rehab Methods
Lateral rehabilitation using CIPP
Lateral Lining without a Seal Top Hats/Brim Type Seal Full Wrap Type Seal
Slide3Lateral Problems - Backups
Blockages due to Roots
Blockages due to collapses/breaks
Calls from homeowners to municipality
Backups into property
Infiltration/Inflow
Slide4Lateral Problems - Roots
Slide5Lateral Problems - Roots
Roots with cap behind them
Slide6Lateral Problems – Structural/
Offfset
Joints
Slide7Lateral Rehabilitation – Offset Joints
Offset Joint
Slide8Lateral Rehabilitation - Holes
Holes in pipe
Slide9Lateral Rehabilitation - Overcut
Overcut Lateral after M/L Lining
Slide10Lateral Problems - Infiltration
Slide11Lateral Problems
Leaks after main line lining and manhole rehab
Move leaks from one spot to another
Comprehensive rehab projects
Slide12Lateral Problems – I&I Reduction
Leaks after main line lining
Comprehensive rehab projects
RDI/I Peak Flow (
mgd
)
Flow Monitoring (Oak Valley) – Metro Water Services & Davidson County
1.00 2.00 3.00 4.00
Before Any Rehab
After Main Line Rehab
After Lateral Rehab
52%
84%
Slide13Lateral Problems - How Do We Find Them
Phone Calls from Residents with Backups
Overflows
Excessive I&I
SSES
Investigation Using CCTV
Slide14CCTV – Lateral Inspection/Preparation
Need to evaluate like mainlines to design solutions
Need video data to complete evaluation
Understanding of ownership
Slide15Important to determine rehabilitation needs and techniques
Clean pipe to fully evaluate
Inspect the private/public sections as needed
Critical data for design and construction
CCTV – Lateral Inspection/Preparation
Slide16CCTV – Lateral Inspection
Insert camera through cleanout or other access point if available
Slide17CCTV – Lateral Inspection
Launch camera from the main line
No cleanout/access point needed
Slide18Lateral Cleaning
Pre-cleaning Post-cleaning
Slide19Lateral Cleaning
Lateral cleaning techniques have improved
Tools to use from Cleanout/Access point
Slide20Lateral Cleaning
Tools to use from Cleanout/Access point
Removal of roots, debris and CIPP liner
Slide21Lateral Cleaning
Lateral cleaning techniques have improved
Up to 80+ ft from the main line pipe
No clean out needed
Removal of roots & debris
Can be done by twisting hose above ground
Slide22Lateral Rehabilitation
What is goal of lateral rehab?
How much of the lateral is the responsibility of the City/County?
Slide23Lateral Rehabilitation
Dig & Replace
Pipe Bursting
Injection
Grouting
Epoxy Injection
CIPP
Slide24Lateral Rehabilitation
Dig & Replace
Not Trenchless
Timely
Reduces Infiltration
Removes roots
Full structural repair
50 Year Life Expectancy
Full or partial length
Slide25Lateral Rehabilitation
Pipe Bursting
Partial Trenchless
More Timely
Reduces Infiltration
Removes roots
Full structural repair
50 Year Life Expectancy
Full or partial length
Slide26Lateral Rehabilitation
Injection Grouting
Trenchless
Timely
Reduces Infiltration
Can treat roots
Not a structural repair
Assumed 20-25 Year Life Expectancy
Full or Partial Lengths
Acrylamide
, Acrylic,
Acrylate
or Urethane
Slide27Lateral Rehabilitation
Epoxy Injection
Trenchless
More Timely
Reduces Infiltration
Removes roots
Full structural repair
Assumed 50 Year Life Expectancy
Limited Length
Slide28Lateral Rehabilitation
CIPP
Trenchless
Timely
Reduces Infiltration
Removes roots
Full structural repair
Assumed 50 Year Life Expectancy
Full or Short Length Repair
Slide29Lateral Rehabilitation – Long Term Cost Evaluation
Rehab
Type
Structural
Repair
Infiltration
Reduction
Root
Inhibitor
Trenchless
Design
Life
Aprrox
Unit $
50
Year Cost
Excavate & Replace
Yes
Yes
Yes
No
50 Yr
$6500
$6500
Pipe Bursting
Yes
Yes
Yes
Partial
50 Yr
$6500
$6500
Injection Grouting
No
Yes
Yes
Yes
25 Yr
$400
$800
Epoxy Injection
Partial
Partial
Partial
Yes
50 Yr
$5000
$5000
CIPP
Yes
Yes
Yes
Yes
50 Yr
$3000
$3000
Assumes 3’ of lateral repair, except epoxy injection
Slide30Lateral Rehabilitation - Specifications
Refer to NASSCO specifications as needed
Refer to manufacturer’s specifications but avoid sole sourcing
Be
specific about what you want, if you don’t specify it then a GC won’t bid it
Refer to ASTM specifications as applicable
Slide31Lateral Rehabilitation - Specifications
Be careful of some standards that include patents – cause sole source bids
Slide32Lateral Rehabilitation - Specifications
Be careful of some standards that include patents – cause sole source bids
Slide33Lateral Rehabilitation - Specifications
Specifications suggestions
Demand experience
Request and
check references
Allow
multiple products to bid
https://www.nassco.org/resources/manufacturer-specifications
https://www.nassco.org/resources/guideline-specs
Slide34Lateral Rehabilitation - Specifications
Submittals
Experience
of Contractor
Product Qualifications
3
rd
Party Test Data
Long term test data
Product Data
Bypass
Pumping (if required)
Installation
Data
Slide35CIPP Lateral Lining
Liners are similar to those used in main line CIPP rehabilitation
Multiple Resin Systems
Polyester –
Vinylester
– Epoxy - Silicate
Cure Systems
Ambient – Steam – Water – UV
Meet typical ASTM specs for CIPP
Slide36CIPP Lateral Lining
Lateral liners that line lateral but do not provide a lateral to mainline interface seal
Slide37CIPP Lateral Lining
Lateral liners that provide a lateral to mainline interface seal but limited lateral lining
Slide38CIPP Lateral Lining
Lateral liners that provide a lateral to mainline interface seal and lateral lining
Slide39CIPP Lateral Lining –
Wetout
CIPP – field
wetout
and liner preparation
Slide40Lateral Pipe Lining – NO SEAL AT M/L
Involves rehabilitating laterals from a lateral access point
At or near the sewer main
At or near the building foundation
Four Methods:
Clean-Out/Access Point Inversion
Double inversion
Single
inversion
Pull-In-Place
Slide41Clean-Out/Access Point Inversion Process
A clean out/access point is required for this process
Installation typically done by use of small “shooters”, “torpedo launchers”, “C.H.I.P. units”, etc.
Installation done using the inversion process
Single or Double inversion methods
Slide42Clean-Out/Access Point Inversion Process
Ambient or steam cure
Invert from pit, manhole
or through cleanout
Invert
liners through 4” and 6” cleanouts
Transition liners
Flexible liners to accommodate size changes
Requires accurate measurements
Slide43Double Inversion Method
Liner Inversion
Bladder Inversion
Bladder & Liner pressurized
Slide44Double Inversion Method
Often times inverted from basement or other access
Can
be steam or water cure
Usually the liner is deflated prior to inversion of the bladder
Slide45Single/Double Inversion Method
Liner &
bladder are simultaneously or separately inverted
Camera can be inserted into
the bladder
Pressure is maintained
and the liner cures
Slide46Single/Double Inversion Method
Ambient or steam cure
Invert from pit, manhole
or through cleanout
Invert
liners through 4” and 6” cleanouts
Transition liners
Flexible liners to accommodate size changes
Requires accurate measurements
Slide47Pull-in Installation Process
A clean out is required for this process
Installation done by pull-in process
Slide48Pull-in Installation Process
Can be completed via pull in through the cleanout toward the main or
Pull in through the main and up to the cleanout
Requires access to be no less than diameter of pipe being lined
Has limitations due to pull in process
Ojs
Broken pipe
Sharp edges
Slide49Lateral Pipe Lining – WITH SEAL AT M/L
Involves rehabilitating the interface between the
lateral and the m
ain
line from the mainline sewer
A portion or all of the lateral can be lined at the same time
Length of lateral that is lined is dependent upon specification and product/installer
Some require cleanouts
Slide50Styles of CIPP Lateral Seals
Full Wrap Style
Top Hat/Brim Style
Slide51“Brim” Style of CIPP Lateral
Industry terminology – “Top Hat”
Process installed from the mainline
No clean out is required
Typically installed after mainline CIPP
A bladder is used to inflate to put in place the resin saturated liner
Slide52“Brim” Style of CIPP Lateral
Some products extend short lengths up lateral
Some products can extend long lengths up lateral
Some
products
depend on tight fit to host pipe
Some
products use h
ydrophilic materials to seal the connection at the main
Slide53“Full-Wrap” Style of CIPP Lateral
Installed after main line rehabilitation, if any required
Installed from mainline
No clean out is required
A bladder is used to inflate and position the resin saturated liner in place
Liner forms a full circle around the inside of the main sewer pipe
The main liner is approx. 16” in length and is 360
0
within the main line pipe
Slide54“Full-Wrap” Style of CIPP Lateral
Typical lateral lengths are from main line up to 75+ ft.
Further lengths are available but each product has different restrictions
A clean out is sometimes required for longer lengths
Som
e products use a
hy
drophilic
material to seal the lateral connection at the main and the terminating end of the CIPP liner
Some products depend on tight fit to host pipe for seal
Slide55Lateral Rehabilitation – Pre & Post Rehab
Slide56Lateral Rehabilitation – Pre & Post Rehab
Slide57Combination of CIPP Technologies
Length of lateral
liner is product specific
Length may be dependent upon curing method
Size of seal can vary
Some designed to adhere to host pipe/liner
Shorter lengths often times used in conjunction with lateral liners installed from the cleanout or other access point (2 step process that requires cleanout or access point)
Slide58Hydrophilic Materials
Used to seal lateral
connection at the main
Expands upon contact with water
Various Configurations
Paste
Gaskets
O-Rings
Slide59Hydrophilic Materials
Various materials have been tested after years of service and confirmed effectiveness to seal through hydration/dehydration cycles
Some products state no need for hydrophilic materials due to adherence to pipe wall
Acquire
test data confirming product performance
Slide60Can we Cutout Lateral Liners?
Removing
liner
Picote
cutter
Requires cleanout
Slide61Brush out small lumps
or excess resin
Removing
full wrap liner
Cutout mainline piece
Can we Cutout Lateral Liners?
Slide62CIPP Lateral Lining Design
Understand relevance of ASTM standards
Competitive bidding
Require experienced
Contractors installing a proven product
Understand need for cleanouts
Understand need for work on private property
Slide63CIPP Lateral Lining Pricing
Pricing is driven by production
Production is driven by tap density
Length of lateral rehab
Camera launch or pan and tilt from main
Length
of cleaning required
Length
of lateral for lining
Existence
or Need for cleanout
Wage rates
Slide64NASSCo
Links
https://www.nassco.org/resources/guideline-specs
https://www.nassco.org/sites/default/files/lateral_seals_14oct2016.pdf
Slide65Thank You
Questions?